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Detrimental effects of capacitance on high-resistance-grounded mine distribution systems.

Authors
Sottile-J; Gnapragasam-SJ; Novak-T; Kohler-JL
Source
IEEE Trans Ind Appl 2006 Sep/Oct; 42(5):1333-1339
NIOSHTIC No.
20031043
Abstract
Modern underground coal mines can be very large, having a total connected load in excess of 15 000 hp. These, mines generally have many miles of high-power conveyor belts and 15 or more miles of high-voltage power cables at distribution voltages of 12.47, 13.2, 13.8, or 14.4 kV. The shielded cables used in mine power distribution systems have a significant level of capacitance, on the order of 110 pF/ft. This level of capacitance, in an extensive power distribution system at today's voltage levels, can cause significant charging currents during a ground fault. This paper addresses the potential detrimental effects of capacitance charging currents during line-to-ground faults in mine power distribution systems. A representative mine power system is modeled, and simulations with faults at various locations are conducted to evaluate the effects of this capacitance on the level of fault current and relay selectivity. This paper also includes results of capacitance measurements made on mine power feeder cables used to validate the simulation model.
Keywords
Mining-industry; Underground-mining; Coal-mining; Cables; Mining-equipment; Simulation-methods; Models
CODEN
ITIACR
Publication Date
20060901
Document Type
Journal Article
Fiscal Year
2006
NTIS Accession No.
NTIS Price
Issue of Publication
5
ISSN
0093-9994
NIOSH Division
OD
Priority Area
Mining
Source Name
IEEE Transactions on Industry Applications
State
KY; VA; PA
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